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Windows 7: high pitched nasty sounding noise coming from laptop

I was over at a friends tonight and she has an hp I5 laptop...not sure of the model# and it is getting a high pitch noise that can be heard from as far as about 6 feet away. This is a consistant and steady noise. This just started today. It is running hotter than normal from what she said. The laptop is about 2 yrs old.

I checked one of the fans and I felt some air coming out, and I could hear the fan running, but I had a hard time identifying where the noise is coming from...

What components would most likely be the cause. Certainly the fan, I would think, but what else could it be? I won't risk opening up the case, but is there any additional troubleshooting I should try?

Thanks for your suggestion, I'll have her check the optical drive, but I don't think anything is in there. I guess she may need to take it in for repair. If it was mine, I would open up the case and repair it myself, but I don't want to risk messing anything up on her machine. Thanks for your suggestion- Carl

I am a professional Technician and have encountered high pitch noise many times. I've tried it all, change processor, change memory, fans, heat sink you name it. By accident I took a hard drive out of one laptop because of high pitch noise (Tested Perfectly 100% performance and health) put in another laptop and boom same high pitch noise. Same scenario with HP Desktop. It's the hard drive! Yay

high pitched nasty sounding noise coming from laptop

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